QScopedArrayPointer: port to qsizetype

[ChangeLog][QtCore][QScopedArrayPointer] Is no longer limited to 2Gi
elements in size.

Task-number: QTBUG-103533
Change-Id: Ic591b3245c53d478e42ff054e01054d855b38685
Reviewed-by: Sona Kurazyan <sona.kurazyan@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/tools/qscopedpointer.cpp

@@ -276,24 +276,30 @@ QT_BEGIN_NAMESPACE
 */
 
 /*!
-    \fn template <typename T, typename Cleanup> T *QScopedArrayPointer<T, Cleanup>::operator[](int i)
+    \fn template <typename T, typename Cleanup> T *QScopedArrayPointer<T, Cleanup>::operator[](qsizetype i)
 
     Provides access to entry \a i of the scoped pointer's array of
     objects.
 
     If the contained pointer is \nullptr, behavior is undefined.
 
+    \note In Qt versions prior to 6.5, \a i was of type \c{int}, not
+    \c{qsizetype}, possibly causing truncation on 64-bit platforms.
+
     \sa isNull()
 */
 
 /*!
-    \fn template <typename T, typename Cleanup> T *QScopedArrayPointer<T, Cleanup>::operator[](int i) const
+    \fn template <typename T, typename Cleanup> T *QScopedArrayPointer<T, Cleanup>::operator[](qsizetype i) const
 
     Provides access to entry \a i of the scoped pointer's array of
     objects.
 
     If the contained pointer is \nullptr behavior is undefined.
 
+    \note In Qt versions prior to 6.5, \a i was of type \c{int}, not
+    \c{qsizetype}, possibly causing truncation on 64-bit platforms.
+
     \sa isNull()
 */
 

src/corelib/tools/qscopedpointer.h

@@ -201,12 +201,12 @@ public:
     {
     }
 
-    inline T &operator[](int i)
+    T &operator[](qsizetype i)
     {
         return this->d[i];
     }
 
-    inline const T &operator[](int i) const
+    const T &operator[](qsizetype i) const
     {
         return this->d[i];
     }